The Structure Parameters Design Of Hydraulic Mount With Inertia Track

As the isolator of powertrain, the hydraulic engine mount(HEM) has been widely used in the field of automobile, aerospace and so on. There is resistance for the HEM when the liquid flows through the inertial track, which will have the higher stiffness and damping compared with the conventional rubber. The powertrain mount system would be asked to offer the rational stiffness to meet the performance target of vehicle. The mount researcher is always focused on that how to make sure the inner structure parameters of HEM, which make the dynamic property of HEM to satisfy the requirement. To make clear the affection of inner structure parameters to the dynamic property, the research work of this dissertation includes:Firstly, build up the lumped parameters model of HEM to describe the dynamic stiffness, and analysis the influence of model parameters to the hydraulic property. It could be divided into four components for the HEM in the function of structure: main rubber, upper chamber, inertial track and bottom chamber. The physical model of each component is to build according to the fluid mechanics and Newton mechanics, and combine these models to get the state equation of HEM. It helps to figure out the dynamic properties expression of HEM.Secondly, the model parameters of HEM, used to express the damping properties, are measured with the special tooling generally. It is no useful in the ahead of design guide. In the meanwhile, the dynamic property of HEM is related with the excitation amplitude, which could not be expressed in the lumped parameters model. So it needs to make clear that how the fluid flows in the inertial track based on the viscous fluid mechanics. It needs to solve these model parameters with structure parameters, and including the effect of excitation amplitude.Finally, the structure parameter design of HEM could be realized by using of MATLAB software. Take this model in practice, and compare the dynamic stiffness between the simulated from model and the actual test with sample. The result shows that the fitness is high enough to support the engineering development of HEM.